百度steamcam下载https://steamcdn-a.akamaihd.net/client/installer/steamcmd.zip
把下面的代码保存到BAT定时运行

D:\steamcmd\steamcmd.exe +login anonymous +force_install_dir E:\SteamLibrary\steamapps\common\ARK +app_update 346110 validate +quit
pause

说明：D:\steamcmd\steamcmd.exe为下载到的steamcmd，目录可以自定义，绝对路径、相对路径都可以
+login anonymous 匿名用户登录
+force_install_dir 后面为游戏路径
+app_update 后面为游戏steamID
validate 验证完整性

进阶篇：

rem --------- config start ---------rem Thanks to Wildcard for this!SET SteamLogin=anonymous

SET GameID=346110
SET GamePath=%~DP0\ark
rem path where the game will be located. End it with "\"

SET SteamCMDPath=%~DP0\steamcmd\
rem path of steamCMD files. End it with "\"

rem --------- config end ---------

%SteamCMDPath%\steamcmd.exe +login %SteamLogin% +force_install_dir %GamePath% +app_update %GameID% validate +quit
pause

红框内为STEAM游戏ID